This part specifies the basic requirements of the test method and the content of the report for the determination of the surface tension of the aqueous solution of pesticides. It is applicable to the determination of the surface tension of the aqueous solution of the pure product, the original drug and the preparation of the pesticide in the pesticide registration test. The essential normative documents are cited, such as the specifications of the water used in the analysis laboratory and the test methods, etc. The term indicates the definition of the surface tension and indicates that the Measuring method should be carried out at a specific temperature, using the ring method and the platinum plate method, specific determination steps and safety tips.